| House of Pixels AS | | 2019 |
| Hovland Equity AS | | 2026 |
| HSH Tecon AS | Professional & scientific | 2012 |
| HSJ Kapital AS | | 2026 |
| Hsmholding AS | | 2024 |
| HSR Eiendom AS | Real estate | 2006 |
| HSS IMPREGNERING ans | Other services | 1988 |
| HTH Kjøkken Drammen AS | Wholesale & retail | 2008 |
| Hti AS | Professional & scientific | 2026 |
| HTL Holding AS | | 2026 |
| HTM Holding AS | | 2021 |
| Htren Fuel Systems AS | Wholesale & retail | 2005 |
| HTS Dynamics AS | Manufacturing | 1981 |
| HTS Eiendom AS | Manufacturing | 1984 |
| HTS Invest AS | Manufacturing | 1984 |
| HTS Packline AS | Wholesale & retail | 1984 |
| Hubro Digital AS | Professional & scientific | 2025 |
| Hud & Velværeklinikken AS | Other services | 2020 |
| Hudsykepleieren AS | Other services | 2022 |
| Human Power Group AS | Education | 2013 |
| Hunnestad Regnskap Da | Professional & scientific | 1997 |
| Hus & Hage Drammen AS | Wholesale & retail | 2002 |
| Husdoktoren AS | Information & communication | 2021 |
| Husebysletta 9 AS | Real estate | 2001 |
| Husebysletta Eiendom AS | Real estate | 1982 |
| Husemoen AS | Professional & scientific | 2020 |
| Husemoen Holding AS | | 2026 |
| Husevåg Invest AS | | 2020 |
| Husnet AS | Real estate | 2020 |
| Hussain Auto AS | Other services | 2026 |
| Husvær Eiendomsinvest AS | Real estate | 2023 |
| Husvær Holding AS | Construction | 2019 |
| Husås Eiendom AS | Real estate | 2012 |
| HV Property AS | Real estate | 2022 |
| HV Stubberudveien 76 AS | Real estate | 2018 |
| Hvaskil AS | Real estate | 2018 |
| Hverdagslykken Da | Administrative & support | 2025 |
| Hvite Smil AS | Health & social care | 2016 |
| Hvitskjær AS | Financial services | 2013 |
| HX Norge AS | Wholesale & retail | 2014 |
| Hydratek AS | Professional & scientific | 2026 |
| Hydronyx AS | Professional & scientific | 2026 |
| Hyedal Invest AS | | 2025 |
| Hyggen Eiendom AS | Real estate | 2004 |
| Hylland Consult AS | Health & social care | 2006 |
| Hymek AS | Wholesale & retail | 2012 |
| Hyperbaric Instruments AS | Manufacturing | 2016 |
| Hyttebyggservice AS | Real estate | 2012 |
| Hyttelykke AS | Real estate | 2018 |
| Hyttemasters AS | Construction | 2023 |
| Håkon Jølberg Invest AS | Financial services | 2005 |
| Hårtuppene AS | Other services | 2021 |
| Håst Rør AS | Construction | 2013 |
| Höitorvet Eiendom AS | Professional & scientific | 2006 |
| Hörnlund Invest AS | Real estate | 2022 |
| Høgehaug Eiendom AS | Real estate | 2021 |
| Høgehaug Holding AS | | 2021 |
| Høgås Industri Og Næringspark AS | Real estate | 2017 |
| Høida Kjøkken AS | Wholesale & retail | 2012 |
| Høvding Holding AS | Professional & scientific | 2013 |
| Høvik Næringspark AS | Real estate | 2000 |
| Høvik Næringspark Holding AS | Real estate | 2022 |
| Høvik Utvikling AS | Real estate | 2018 |
| Høvås Utvikling AS | Professional & scientific | 2025 |
| Høydal Holdco AS | | 2024 |
| Høydehuset AS | Education | 2005 |
| Høyden Invest AS | Real estate | 2016 |
| Høye Invest AS | | 2020 |
| Høylandet Holding AS | | 2021 |
| Høøk Hestesport AS | Wholesale & retail | 1995 |
| Ian Neil Graphics Da | Manufacturing | 1993 |
| Iat Holding AS | Construction | 2005 |
| Ibra Eiendom AS | Real estate | 2018 |
| Ibra Holding AS | Real estate | 2018 |
| Ibsen Innovasjon AS | Real estate | 2026 |
| Icp Eiendom AS | Real estate | 2014 |
| Idar Dahl Holding AS | Other services | 2015 |
| Ide Regnskap Og Økonomi AS | Professional & scientific | 2023 |
| Idegranen Invest AS | | 2023 |
| Ideo Solutions AS | Information & communication | 2015 |
| Idrettsdugnad SA | Other services | 2017 |
| Ieiendom AS | Real estate | 2015 |
| Iexcel AS | Information & communication | 2009 |
| Igaidi AS | Professional & scientific | 2005 |
| Igc AS | Hospitality | 2021 |
| Iged Invest AS | | 2026 |
| Igk Holdning AS | | 2022 |
| Ikt Partner 24 AS | Information & communication | 2023 |
| Ikt Partner 24 IT AS | Information & communication | 2023 |
| Ikt Partner 24 Tele AS | Information & communication | 2023 |
| Ild Eiendom AS | Real estate | 2010 |
| Ildfast-Service AS | Construction | 2017 |
| Ildsjel App AS | Information & communication | 2026 |
| Ileflor Invest AS | Financial services | 2011 |
| Ilg 27 AS | Real estate | 2009 |
| Illuminati Holding AS | | 2024 |
| Ilmano AS | Information & communication | 2014 |
| Ilstad Kjøkken & Interiør AS | Wholesale & retail | 2024 |
| Imani Consulting & Investment AS | | 2020 |
| Imara AS | Information & communication | 2018 |